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CA Patent: CA-74,997
Variable speed mechanism
Patentee: William Lorraine Schellenbach (exact or similar names) - Cincinnati, OH USPTO Classifications: Tool Categories: metalworking machines : metal lathes Assignees: None Manufacturer: National Machine Tool Co. (Cincinnati) - Cincinnati, OH Witnesses: Cordelia O'Hearn Theodore Carl Jung	Patent Dates: Applied: Oct. 14, 1901 Granted: Mar. 04, 1902 Patent Pictures: CIPO Data Report data errors or omissions to steward Jeff Joslin "Vintage Machinery" entry for National Machine Tool Co. (Cincinnati)
Description: This is the Canadian equivalent of US patent 683,003, which was explicitly assigned to National Machine Tool Co. of Cincinnati.

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